Improvement in bark-mills



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Letters Patent No. 111,897, dated January 31, 1871.

IMPROVEMENT IN HARK-MILLS.

The Schedule referred to in these Letters Patent and making part of thesame. I

annular head, forming a bearing for the shaft of the` ruimer andcrushers independent-ly of the peculiar and vnovel breaker keyed to Atheshaft, together with the Y central (lished step, with beveled sides, toreceive the tapered gud'geon o f therunner, which is adjustableverticallyand laterally. to centralize the runner;

also, th'e construction of the crushing and grinding teeth.

Figure l represents a vertical section ofthe shell, runner, crushing,and grinding-teetl1,'and breaker at Figure 2 shows a perspective view ofthe shell with its central arms.

Figure4 3 `is a perspective view ofthe conical runner with its tecth.- v

Figure 4 represents the eross-bars constituting the adjustable step.

Figure 5 shows the angles o f -the cutting edges of the lower teeth onthe shell and runner.

Toeuable others skilled in the art to make and use my invention, I willproceed to describe it' as follows:

The-object oi' my invention is the perfect adjustnient of themill, sothat the breaking, crushing, and grinding operation is regular,preventi'ngthe escape of coarse pieces of bark, or the clogging orgulnming of the mill. v i j The shellv A is provided with lugs B Babove, perforated for attaching ahopper, also sim-ilarlngs C O below, tosecure the niill to a proper framework at four sides, 'and intermediatewith the lugs O are four lugs D ID, with holes to receive the stern `ofthe adjustingy belts,A E E, that are secured by pairs of jam-nuts totheuprightanged ends G Gr ot the cross-bars H H. In the center ofthearms H is the dished step N.

The four armsI I, shown, are a part of the shell, and are provided withtriangular teeth J J, set iuclined on the lowerl sides ofthe arms, so asto besparallel with the conical side of the runner K, Athe shaft L ofwhich has its bearingin. the union P. p

This runner K is of the usual conical t'orrn above, but is provided witha series of about nine rows of teethM M. These teeth `have a verticaltriangular face and a triangular base, so arranged, somewhat spirally,that each succeeding tooth is slightlyin advance of the other, in orderto bring them into action in quick'succession.

` The base of the cone is slightly tapered downward from the cone, andis provided with a series of grad- `vuatcd oblique grinding-teeth N N,the shortest starting from the edge of theybasc, and inclined, say, atan angle of thirty degrees, so thatthe front andlongest tooth is in theleadfaud extends -upward onto the cone.

In afull-sized machine the cut-ting edges of these lower teeth N arebeveled forabout the distance of an inch vertically, and parallel to andin close connec- 'tion with 'the lower ends ot' the grinding-teeth It,on

the inner surface ofthe shell, as shown at ng. 5.

Above the grinding-teeth of tbe lower series ot' teeth are crushers S S,on the shell.

The breaker T is keyed to and revolves with the shaft Il over the iixedand stationary, arms I, and the cutting-edge sections of the breaker 'loperate shearfashion, andpreparc the bark for the crushing action of theteeth J and M, on thc lower sides of arms I,

and upper side'of runner K, and crushers S of the shell A, successivelyreducing the' bark for the inal action of ,the grinding-teeth N and R tothe quality desired.

The edges of the lower grinding-teeth N and R project out-ward at theirtops, and are tapered to with in an inchof their lower ends, where'theyare beveled parallel to each other, as shown at fig. 5,' for thepurposeof more thoroughlyand easily grinding the bark, while thedifference ofthe angles of the cuttingedges of the teeth and the spacesY Y, between each one ofthe grinding-teeth, allows those portions of thebark, sufficiently reduced, topass through without being retained andunduly pulverized, and effectually.

prevents tho clogging or gumming of the mill, as is i' the case in theordinary arrangement of teeth closc together, and enables the mill tnobe closely adjusted to prevent the escape ofcourse pieces of bark.

The cross-arms H, with their central-closed step N, shown at iigs.,4 andl, have their four ends turned up vertically', then horizontally, atright angles G, with square holes, and side lugs V perforated with afemale screw for the lateral adjustment to centr-alize the runner K with4its gudgeon W, that is slightly tapering at its base, to adjust itself,in wear, with the inclined sides of the step N. i

The square-headed adjusting-screws X X'are held by jam-nuts, and thescrews are operatedagainst the outside oi' thc shell A Jto'produce thecentral adjustment. f

@he step is vertically adjusted by the suspending bolts E E. By thistwofold adjust-ment the teeth N, all constructed and arranged as shownand described, for the purpose set forth.

ofthe runner and those of the'shell are completely prevented fromscntching or grinding each other.

Other advantages of my invention are the stepboX 1ST in the cross-barII, and the mode of adj ustingA laterally; also, the crushing-arms I,four, more or less, as connected solid with the shell A, are so strongand centrally united as to be arfirr'n support to pre-y ser've thevertical position of the shaft L. v

`The manner of arranging the .teeth S and R on the shell, as shown atfig. 2,-and lthe graduated and angular teeth M and N on the runner K,and the beveledged and toothed-breaker C operating in conjunction withthe inclined and toothed-arms I, producing a regular, unfailing,breaking, crushing, and grinding result.

What I claim as my invention, and desire to secure by Letters Iater '5,is--'4 1. The conical runner K, provided with the triangular teeth M,and graduated tapering grinding-teeth 2. The shell A, providedy with thetangential graduated teeth S, radial tapering teeth It, and arms I,provided with teeth J, all constructed and arranged as'shown, for thepurposes described.

Y 3. v The combination and arrangement of thevshell A and'runner K,constructed as described, with the Ybreaker T, provided with shear-teetht, and the crossbars H, all constructed substantially as'shown anddescribed, forrthe purposes herein set forth.

i. The cross-bars H, with their ends G and lug V, and adjusting screws Eand X, for adjusting the runner K vertically and laterally, as hereindescribed;

5. The construction of the breaker T, attached to the shaft L, as hereindescribed, and for the purpose set forth.

-Viitnesses' J. FRANKLIN REIUART, J AMES Onoss.

